adds spec for letter verification tries [#332]

spec/features/verification/letter_spec.rb

@@ -76,4 +76,24 @@ feature 'Verify Letter' do
     expect(URI.parse(current_url).path).to eq(new_sms_path)
   end
 
+  scenario '3 tries allowed' do
+    user = create(:user, residence_verified_at: Time.now, confirmed_phone: "611111111")
+    login_as(user)
+
+    visit new_letter_path
+    click_button 'Send me a letter with the code'
+
+    3.times do
+      fill_in 'letter_verification_code', with: "999999"
+      click_button 'Send'
+    end
+
+    expect(page).to have_content 'You have reached the maximum number of letter verification tries'
+    expect(URI.parse(current_url).path).to eq(account_path)
+
+    visit new_letter_path
+    expect(page).to have_content 'You have reached the maximum number of letter verification tries'
+    expect(URI.parse(current_url).path).to eq(account_path)
+  end
+
 end